Safety attachment for machines.



A. STIER.

SAFETY ATTACHMENT FOR MACHINES.

APPLICATION FILED AUG-1.19m.

Patented Feb. 26, 1918.

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SAFETY ATTACHMENT FOR MACHINES.

APPLICATION-FILED AUG- 7, T916.

1,257,759. Patented Feb.26,1918.

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ABRAHAM s'rmn, OF BROOKLYN, NEW YORK.

SAFETY ATTACHMENT FOR MACHINES.

Specification of Letters Patent.

Patented Feb. 26, 1918.

Application filed August 7, 1916. Serial No. 113,417.

To all whom it may concern:

Be it known that I, ABRAHAM STIER, a citizen of the United States,-andresident of Brooklyn, in the county'of Kings and State of New York, haveinvented certain new and useful Ii'nprovements in Safety Attachments forMachines, of which the following is a specification.

This invention relates to safety attachments for machines and moreespecially metal working machines such as presses where parts of themachine are caused to move and approach each other while the operator isfeeding material and runs the risk of having his hands or limbs caughtbetween said moving parts.

The device consists of certain mechanism moving in advance of dangerousparts of the machine and controlling the clutch on the power shaft andpreventing the same from connecting the driving means with the operatingshaft of the machine when they said mechanism is obstructed by thefinger or limb of the operator.

These and other objects and details of the invention are more fullydescribed in the following specification, set forth in the claims, andillustrated in the accompanying drawings, wherein:

Figure 1 is a front view of a metal stamping or punching press frameshowing the invention applied thereto. t

Fig. 2 is a plan view of the attachment.

Fig. 3 is a side view of the same.

Fig. 4 is a view similar to Fig. 1 but with the attachment in itslowered position.

Fig. 5 is a side view of the same.

The drawings show the front of the frame 10 of a metal press in which ismounted the shaft 11 for operating a slide that works in the guideways12 and 13 and stamps or punches metal or other material supported on thebase 13.

The guide way 12 carries a bracket 14 extending to the right of theframe and secured thereto by the bolts 15 which also connect the guidesto the frame at each side. These bolts also secure vertically adjustablebrackets 16, passing through slots 17 and adapted to be tightened afterproper ad- 'ustment is secured. Extensions 18 at the lower ends of thesebrackets are adjustable horizontally and carry and are connected byPivoted to the cross bar 90 are two levers 21 and the former lover beingpractically a yoke as shown in Figs. 2 and 5, with both sides pivoted onthe bolt 23, and to the short arms 2 1 and. 25 of the levers areattached links 26 and 27.

The bracket 14 carries a shaft 29 having at one end an arm 30 supportingthe upper ends of the links 26 and 27 and at the other end of the shaftis an arm 31 to which is attached the trcadle rod 32.

The clutch latch of the machine is operated by rods and 37 which areloosely connected by the coupling 38 carried by the rod 33 and in whichthe rod 37 loosely travels. Stops 40 on the latter rod are engaged bythe coupling and operated when. the rod 33 is drawn downward by theforked arm at]. to which the rod is secured by a pin 42 passing throng]an eye at the lower end of the said rod. lhc roa. ")2 passes througi iand secured to the head 4-3 of the pin 42 and when the troadle is deprel. the clutch will operate if the levers 11 2 .id 22 are able to passeach other.

To operat the with Whirl the usual treadle ines are provided is :2 ist'lltl'lSi'. downward, and esevating the arm :Ztland, 27, causing the oapproach each other and as the lever is'the longer and lever free to p;the .t. the latter does 'so if no ob: -:truct1on intervenes.

If, however, an object such as a hand or finger should be in line withthe slide and be in danger of injury it will also be in the path of theclosing levers as shown in the dotted lines in. Fig. 1 and will act asan obstruction to their closing and passing each other to the positionshown in Fig. l. lVhen occupying the latter position the clutch connectsthe parts so as to cause the downward movement of the slide, but if afinger or hand obstructs the movement of these levers and prevents theirmovement beyond the position shown in dotted lines in Fig. 1, thetreadle rod will be likewise prevented from moving far enough to throwthe clutch parts into engagement. During the operation 0:!

the machine, the levers 26 and 27 will continue to pass each other untilan obstruction is presented to their movement.

The lever 22, or both levers 21 and 22, may be faced with rubber 36 toprevent injury to the finger or limb it may come in contact with.

The length of the levers 21 and 22 and the arm 80 tends to materiallyweaken the power of these parts when an object is caught between themand although imparting only a slight pressure, the levers will retardthe movement of the treadle and the operation of the clutch.

It is ob ions that this device may be applied to similar machines whereit is necessary for workmen to expose their hands or limbs and where themovement of the levers or arms will control the movement of the drivingshaft or other important parts.

The parts may also be otherwise arranged or modified without departingfrom the essential features above described or from the scope of theappended claims.

A spring 39 on the rod 33 returns the rods and the other parts to theirplaces when the treadle is released.

lVhat I claim as new is:

1. In a safety attachment for machines, the combination with a machineframe and a clutch, of a treadle rod adapted to operate the clutch,levers pivotally mounted upon a fixed support and adapted to pass eachother, and means positively connecting said levers with said treadle rodwhereby the movement of said treadle rod will be arrested by aninterruption of the movement of said levers.

2. In a safety attachn'ientfor machines, the combination with a machineframe, of a shaft and clutch, a treadle rod to control the clutch,levers pivoted to the frame and adapted to pass each other, an armconnected with the rod, and a second arm on the same shaft as the firstand connected with the levers. y

In a safety attachment for a machine, the combination with a machineframe, of a driving shaft, a clutch, levers pivoted at the front of themachine and adapted to pass each other, a rod ada ted to o crate theclutch, a shaft at the si e of the rame, an arm on the shaft andconnected with the rod, a second arm on the shaft, and links connectingthe latter arm with the levers.

&. In a safety attachment for a machine, the combination with a machineframe, of slotted brackets adjustable at the front of the frame andcarrying a cross bar, levers pivoted to the cross bar and adapted topass each other, a shaft with a crank arm, links connecting the crankarm with the levers to swing them on a pivot, a second arm on the shaft,a rod connected with the secmid arm and adapted to be operated by themachine attendant, a rod connected with the clutch of the machine andhaving stops. and a rod with a spring interposed between the clutch rodand the operated rod.

5. In a safety attachment for a machine, the combination with a machineframe, of bracket adapted to be adjusted on the front of the frame, across bar carried by the brackets, levers pivoted on the cross bar, ashaft at the side of the frame, an. arm on the shaft, links connectingthe arm with the levers, a rod with stops connected with the clutch ofthe machine, a second rod having acoupling for the first rod, a spring,and an operating rod connected with the second rod and operating thelevers.

Signed at New York, in the county of New York and State of New York,this 25th day of July, A. D. 1916.

ABRAHAM STTER.

00p! a! flail pltelt my be obtained for five cent: each, by addressingthe "Commissioner of Patents,

Washington, D. C.

